public class Kreis extends BasisKlasse
{	
	// double pi = 3.14159265359;
	private double x;
	
	public Kreis(double x)
	{
		this.x = x;
	}
	
	public double berechneFlaeche()
	{
		return java.lang.Math.PI*(x*x);
	}
	
	public double berechneUmfang()
	{
		return 2*java.lang.Math.PI*x;
		
	}
}
	